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In a world with two similar, developed economies, economic integration can cause a permanent increase in the worldwide rate of growth. Starting from a position of isolations, closer integration can be achieved by increasing trade in goods or by increasing flows of ideas. We consider two models with different specifications of the research and development sector that is the source of growth. Either form of integration can increase the long-run rate of growth if it encourages the worldwide exploitation of increasing returns to scale in the research and development sector.

Elasticities of substitutions between U.S. imports from Mexico, Canada, the rest of the world, and competing domestic production are estimated for 128 mining and manufacturing sectors, based on quarterly data for 1980-88. Results will be useful for subsequent computable general equilibrium (CGE) model simulations of North American trade, including the proposed free trade area between Mexico and the United States.